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| NAS - Nonindigenous Aquatic Species |
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Common Name: Digenean Fluke
Synonyms and Other Names: Tetracotyle diminuta
Taxonomy: available through 
Identification: This digenetic trematode species occurs in metacercarial form (encysted larvae in cases) in host fish. These larvae have an oral sucker, pharynx, pseudosucker (depression surrounded by thick edges), and a definite ventral sucker (Mattheis and Odening 1980).
Size: Metacercariae are typically 150-430 µm by 130-340 µm in size, and encapsulated cysts can measure 285-565 µm by 270-530 µm - However, in one study, adult worms measured 115 x 70 µm
Native Range:
Native to the Black Sea basin (Pronin et al. 1997b).
Nonindigenous Occurrences: Observed for the first time in 1992 in Lake Superior and its tributary, the St. Louis River, on introduced Eurasian ruffe (Gymnocephalus cernuus). It was subsequently recorded from Lake St. Clair in 1994 in two round gobies (Neogobius melanostomus) (U.S. Department of the Interior 1993; Pronin et al. 1997b).
Ecology: This digenean fluke is very common on many fish species in its native range. Metacercariae occurred in the mesentery and body cavity of round gobies from Lake St. Clair and ruffe from Lake Superior (Pronin et al. 1997a; Pronin et al. 1997b; U.S. Department of the Interior 1993).
Means of Introduction: Very likely introduced with host fishes in ballast water (U.S. Department of the Interior 1993).
Status: Likely established where recorded.
Impact of Introduction:
A) Realised: None.
B) Potential: I. pileatus is unlikely to have any significant effect in terms of regulating the round goby population in Lake St. Clair or any of the Great Lakes (Pronin et al. 1997b). It is possible that its presence, in combination with that of other more prevalent parasites in G. cernuus, increases this fish species’ susceptibility to the negative effects of anoxia (Pronin et al. 1997a).
Remarks: I. pileatus is synonymous with Tetracotyle diminuta.
References
Mattheis, V. T. and K. Odening. 1980. Role of fishes in the life cycle of Ichthyocotylurus species (Trematoda: Strigeidae) in the source area of the Spree and Havel Rivers of East Germany. Milu (Berlin) 5(1-2):261-278.
Pronin, N. M., D. Selgebi, S. V. Pronina, and T. Darlen. 1997a. Effect of parasites on resistance to oxygen starvation in the ruffe (Gymnocephalus cernuus). Russian Journal of Ecology 28(4):278-280. Translated from Ekologiya 4:314-316.
Pronin, N. M., G. W. Fleischer, D. R. Baldanova, and S. V. Pronina. 1997b. Parasites of the recently established round goby (Neogobius melanostomus) and tubenose goby (Proterorhinus marmoratus) (Cottidae) from the St. Clair River and Lake St. Clair, Michigan, USA. Folia Parasitologica (Ceske Budejovice) 44(1):1-6.
Shigin, A. A. 1978. On the role of freeliving developmental stages of trematodes in biocoenoses. Parazitologiya (St. Petersburg) 12(3):193-200.
U.S. Department of the Interior. 1993. Research Information Bulletin, U. S. Department of the Interior, National Biological Survey No. 97. 2 pp.
Author: Rebekah M. Kipp
Contributing Agencies: 
NOAA - GLERL
Revision Date: 6/21/2007 Citation for this information:
Rebekah M. Kipp. 2009. Ichthyocotylurus pileatus. USGS Nonindigenous Aquatic Species Database, Gainesville, FL.
<http://nas.er.usgs.gov/queries/FactSheet.asp?speciesID=2720> Revision Date: 6/21/2007
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